I have Different Perspectives on Things than my Boyfriend?

So I need opinions. My boyfriend loves partying and I am just a chill person at home. He goes to parties and gets drunk most of the time. During one of the parties he apparently accepted a girl's follow request on ***, later told me she was persisting on it which is already a red flag? I thought it's a drunken mistake and let it slide but when he was checking who to remove from followers he hasn't removed her which made me sad and maybe mad even. He only did so when I brought it up.

I don't know I'd trust him with that but he is so okay with hearing his friends' stories of making out during parties that he tells me about them while laughing and expects me to be amazed or something I guess but I am a closed minded person when it comes to these kind of things as I think these moments are special and should be a couple-only thing I am aware I can't change his opinion on that but I just feel like things have built up inside me that makes me question things i guess? It's just that he doesn't have female followers but when he gets one and is someone he says is 'not important' he still doesn't remove them and it gets me confused. He also did make out with someone once before we got together and whenever he mentions whatever his friends got to do I get reminded of it. I know it's his past that we can't change but still is it really okay to normalize these things without any commitment? I feel like him not understanding that these things bothering me makes our relationship a dysfunctional one.